今天做的是python的学生信息表
最近总是在urrlib.request.urlopen上面出错，我真的不晓得该怎么使用这个
有人告诉我刚开始容易在urrlib里面出错，先采取requests来操作
那么urrlib.request.urlopen怎样用requests来替换？
在我的增加学生信息里面的话语是这样的：
st = st.encode()
content = urllib.request.urlopen(url + "?opt = insert", st)
还有人说我的urllib.request.urlopen（）的用法都用错了。
这个是服务器的代码
import flask
import sqlite3
import json
app = flask.Flask(__name__)
class StudentDB:
def openDB(self):
self.con = sqlite3.connect("students.db")
self.cursor = self.con.cursor()
def closeDB(self):
self.con.commit()
self.con.close()
def initTable(self):
res = {}
try:
self.cursor.execute("create table students (No varchar(16) prinmary key , Namevarchar(16) Sex varchar(8) Age int)")
res["msg"] = "OK"
except Exception as err:
res["msg"] = str(err)
return res
def insertRow(self,No,Name,Sex,Age):
res = {}
try:
self.cursor.execute("insert into students (No,Name,Sex,Age) values(????)", (No, Name, Sex, Age))
res["msg"] = "OK"
except Exception as err:
res["msg"] = str(err)
return res
def deleteRow(self):
res = {}
try:
self.cursor.execute("delete from students where No = ?" , (No,))
res["msg"] = "OK"
except Exception as err:
res["msg"] = str(err)
return res
def selectRows(self):
res = {}
try:
data = []
self.cursor.execute("select * from students order by No")
rows = self.cursor.fetchall()
for row in rows:
d = {}
d["No"] = row[0]
d["Name"] = row[1]
d["Sex"] = row[2]
d["Age"] = row[3]
data.append(d)
res["msg"] = "Ok"
res["data"] = data
except Exception as err:
res["msg"] = str(err)
return res
@app.route("/" , methods=["GET","POST"])
def process():
opt = flask.request.values.get("opt") if "opt" in flask.request.values else ""
res = {}
db = StudentDB()
db.openDB()
if opt == "init":
res = db.initTable()
elif opt == "insert":
No = flask.request.values.get("No") if "No" in flask.request.values else ""
Name = flask.request.values.get("Name") if "Name" in flask.request.values else ""
Sex = flask.request.values.get("Sex") if "Sex" in flask.request.values else ""
Age = flask.request.values.get("Age") if "Age" in flask.request.values else ""
res = db.insertRow(No, Name, Sex, Age)
elif opt =="delete":
No = flask.request.values.get("No") if "No" in flask.request.values else ""
res = db.deleteRow(No)
else:
res = db.selectRows()
db.closeDB()
return json.dumps(res)
if __name__ == "__main__":
app.run()
这个是客户端的代码
import urllib.request
import json
import requests
class Student:
def __init__(self, No, Name, Sex, Age):
self.No = No
self.Name = Name
self.Sex = Sex
self.Age = Age
def show(self):
print("%-16s %-16s %-8s %-4d" % (self.No, self.Name, self.Sex, self.Age))
students = []
url = "http://127.0.0.1:5000"
def listStudents():
global students
print("%-16s %-16s %-8s %-4s" % ("No","Name","Sex","Age"))
for s in students:
s.show()
def insertStudent(s):
global students
i = 0
while(i < len(students) and s.No > students[i].No):
i = i + 1
if(i < len(students) and s.No == students[i].No):
print(s.No + "already exists")
return False
students.insert(i,s)
return True
def deleteRow():
global students
No = input("No=")
if(No != ""):
for i in range(len(students)):
if(students[i].No == No):
st = ""
try:
st = "No=" + urllib.request.quote(No)
st = st.encode()
content = urllib.request.urlopen(url + "?opt=delete", st)
st = content.readline()
st = json.loads(st.decode())
st = st["msg"]
except Exception as exp:
st = str(exp)
if(st == "OK"):
del students[i]
print("删除成功")
else:
print(st)
break
def insertRow():
No = input("No=")
Name = input("Name=")
while True:
Sex = input("Sex=")
if(Sex == "男" or Sex == "女"):
break
else:
print("Sex is not vaild")
Age = input("Age=")
if(Age == ""):
Age = 0
else:
Age = int(Age)
if No != "" and Name != "":
s = Student(No,Name,Sex,Age)
for x in students:
if(x.No == No):
print(No + "already exists")
return
st = ""
try:
st = "No=" + urllib.request.quote(No) + "&Name=" + urllib.request.quote(Name) + "&Sex=" + urllib.request.quote(Sex) + "&Age=" + str(Age)
st = st.encode()
content = urllib.request.urlopen(url + "?opt = insert", st)
st = content.read()
st = json.loads(st.decode())
st = st["msg"]
except Exception as exp:
st = str(exp)
if (st == "OK"):
insertStudent(s)
print("增加成功")
else:
print(st)
else:
print("学号、姓名不能为空")
def initialize():
st = ""
try:
content = urllib.request.urlopen(url + "?opt = init")
st = content.read()
st = json.loads(st.decode())
st = st["msg"]
except Exception as exp:
st = str(exp)
if(st == "OK"):
print("初始成功")
else:
print(st)
return st
def readStudents():
global students
try:
students.clear()
content = urllib.request.urlopen(url)
data = b""
while True:
buf = content.read(1024)
if(len(buf) > 0):
data = data + buf
else:
break
data = data.decode()
data = json.loads(data)
if data["msg"] == "OK":
data = data["data"]
for d in data:
s = Student(d["No"],d["Name"],d["Sex"],d["Age"])
students.append(s)
except Exception as exp:
print(exp)
try:
readStudents()
while True:
print("")
print("***学生名单***")
print("0.初始化学生表")
print("1.查看学生列表")
print("2.增加学生记录")
print("3.删除学生记录")
print("4.退出这个程序")
s = input("请选择（0，1，2，3，4）：")
if(s == "0"):
initialize()
elif(s == "1"):
listStudents()
elif(s == "2"):
insertRow()
elif(s == "3"):
deleteRow()
elif(s == "4"):
break
except Exception as exp:
print(exp)
请过目，谢！
